William

O'Neil

Chicago, Illinois

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Member of the Board of Trustees Since September 2019


Bill O'Neil is partner in the Litigation Department of Winston & Strawn in Chicago where he also serves as Chair of the Hiring Committee.


Bill also represents numerous public company clients in corporate governance litigation, shareholder strike suits, internal investigations, and other complex business litigation. He has represented dozens of Fortune 500 companies in disputes ranging from routine to high-stakes (bet the company) litigation. Bill is also frequently called upon to provide risk management and litigation avoidance advice to his clients.


A significant portion of Bill's practice involves representing private equity funds and their portfolio companies. Bill frequently represents buyers and sellers in post-closing disputes, including working capital, representation and warranty, and fraud claims. Bill also represents buyers in claims against representation and warranty insurance carriers.


He has significant antitrust experience. He was defense counsel in In re Automotive Parts Litigation, In re Linerboard Antitrust Litigation, and In re Sulfuric Acid Litigation, and successfully prosecuted price-fixing claims on behalf of Solyndra LLC against three of China?s largest solar panel manufacturers.

Bill's pro bono cases have included representing a prison inmate in a successful appeal before the Seventh Circuit Court of Appeals that resulted in new law in the circuit, the court's reversal of its own prior precedent, and the reversal of the defendant?s conviction.


Bill received his BA from Denison University and his JD from Washington University School of Law.

Member of the Board of Trustees Since September 2019


Bill O'Neil is partner in the Litigation Department of Winston & Strawn in Chicago where he also serves as Chair of the Hiring Committee.


Bill also represents numerous public company clients in corporate governance litigation, shareholder strike suits, internal investigations, and other complex business litigation. He has represented dozens of Fortune 500 companies in disputes ranging from routine to high-stakes (bet the company) litigation. Bill is also frequently called upon to provide risk management and litigation avoidance advice to his clients.


A significant portion of Bill's practice involves representing private equity funds and their portfolio companies. Bill frequently represents buyers and sellers in post-closing disputes, including working capital, representation and warranty, and fraud claims. Bill also represents buyers in claims against representation and warranty insurance carriers.


He has significant antitrust experience. He was defense counsel in In re Automotive Parts Litigation, In re Linerboard Antitrust Litigation, and In re Sulfuric Acid Litigation, and successfully prosecuted price-fixing claims on behalf of Solyndra LLC against three of China?s largest solar panel manufacturers.

Bill's pro bono cases have included representing a prison inmate in a successful appeal before the Seventh Circuit Court of Appeals that resulted in new law in the circuit, the court's reversal of its own prior precedent, and the reversal of the defendant?s conviction.


Bill received his BA from Denison University and his JD from Washington University School of Law.